Table 2.
SWAN Sleep Study Participant Characteristics
| Insomnia | SDB | ||||
|---|---|---|---|---|---|
| Characteristic | All(N=321) | Absent(n=273) | Present(n=48) | Absent(n=257) | Present(n=64) |
| Age, years | 52.1 (2.1) | 52.1 (2.2) | 52.4 (1.9) | 52.0 (2.0) | 52.8 (2.4)** |
| Race/ethnicity, n (%) | |||||
| African American | 112 (34.9) | 90 (33.0) | 22 (45.8) | 85 (33.1) | 27 (42.2) |
| Caucasian | 155 (48.3) | 132 (48.3) | 23 (47.9) | 128 (49.8) | 27 (42.2) |
| Chinese | 54 (16.8) | 51 (18.7) | 3 (6.3) | 44 (17.1) | 10 (15.6) |
| Marital status, n (%) | |||||
| Single/widowed/divorced | 114 (35.5) | 95 (34.8) | 19 (39.6) | 87 (33.9) | 27 (42.2) |
| Married/living as married | 207 (64.5) | 178 (65.2) | 29 (60.4) | 170 (66.1) | 37 (57.8) |
| Education, n (%) | |||||
| Less than college degree | 153 (47.7) | 128 (46.9) | 25 (52.1) | 122 (47.5) | 31 (48.4) |
| College degree or more | 168 (52.3) | 145 (53.1) | 23 (47.9) | 135 (52.5) | 33 (51.6) |
| Menopausal status, n (%) | |||||
| Pre-/early perimenopause | 202 (62.9) | 179 (65.6) | 23 (47.9) | 174 (67.7) | 28 (43.8) |
| Late perimenopause | 60 (18.7) | 51 (18.7) | 9 (18.8) | 41 (16.0) | 19 (29.7)* |
| Postmenopause/surgical | 59 (18.4) | 43 (15.8) | 16 (33.3)** | 42 (16.3) | 17 (26.5) |
| Nocturnal VMS, n (%) | |||||
| No/intermittent occurrence | 215 (67.0) | 192 (70.3) | 23 (47.9) | 174 (67.7) | 41 (54.1) |
| At least 3 nights/week | 106 (33.0) | 81 (29.7) | 25 (52.1)** | 83 (32.3) | 23 (35.9) |
| Body mass index, kg/m2 | 30.0 (7.8) | 29.2 (7.3) | 34.1 (9.4)** | 28.4 (6.4) | 36.4 (9.5)** |
| Chronic health conditions, sum | 0.8 (1.0) | 0.7 (1.0) | 1.2 (1.2)** | 0.6 (0.9) | 1.3 (1.3)** |
| IDS (sleep items removed), 0–24 | 2.8 (2.7) | 2.3 (2.2) | 5.5 (3.3)** | 2.6 (2.5) | 3.5 (3.2)* |
| Polysomnographic TST, minutes | 381.7 (60.8) | 384.5 (58.9) | 365.7 (69.2)* | 383.1 (61.1) | 375.9 (59.8) |
| Use of sleep-affecting medication, n (%) | |||||
| No/intermittent use | 245 (76.3) | 215 (78.8) | 30 (62.5) | 196 (76.3) | 49 (76.6) |
| At least 3 nights/week | 76 (23.7) | 58 (21.2) | 18 (37.5)* | 61 (23.7) | 15 (23.4) |
Data are presented as mean (standard deviation) or n (%), as appropriate. Comparisons of participant characteristics were performed separately according to the presence/absence of insomnia and the presence/absence of SDB using analysis of variance or chi-squared tests, as appropriate. *p<0.05; **p<0.01.
IDS, Inventory of Depressive Symptomatology; SDB, sleep-disordered breathing; TST, total sleep time; VMS, vasomotor symptoms.